Dark, atmospheric piano that immediately sets a mystery tone. Karanoshojo (Kara no Shoujo) is a visual novel with a detective thriller edge, and composer MANYO fills this soundtrack with gorgeous tension. "Main Theme" establishes that melancholy mood and the arrange version deepens it further.
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"Criminal investigation II" adds urgency with quicker rhythmic elements under those brooding melodies. "Rain Of Memories" is the track that lingers. Something about it just stays in your head, haunting without being heavy-handed.
2021 release, so it's a refined take on the series' sound. Multiple arrange versions show how a single idea can shift in meaning. If you want music that sounds like solving a case at midnight, this is it.